Switchable Inductor Trace Layout for Bandwidth Tuning and High Q
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Solution Overview
Problem
Designing an inductor with a switch that maintains a high quality factor (Q value) is challenging due to coupling effects and resistance issues, making it difficult to adjust for different bandwidths.
Innovation Solution
The inductor device comprises multiple traces and a switch that forms different paths when turned on or off, allowing for adjustable bandwidth while maintaining the quality factor, with specific trace configurations and connections to minimize resistance impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch is added inside the inductor to enable bandwidth adjustment, then the adaptability of the inductor is improved, but the quality factor deteriorates due to switch resistance
Solution Approach 1:
The inductor is divided into multiple independent trace paths (first path with first and second traces, second path with third and fourth traces) that can be selectively activated. This segmentation allows the switch to connect different inductor paths without requiring the switch to be in series with the main current path, thereby minimizing the impact of switch resistance on the quality factor while enabling bandwidth adjustment capability.
2Adaptability or versatility
If multiple traces are configured to form different paths, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
Multiple inductor paths are merged into a single inductor structure with shared terminals and overlapping trace layouts. The first inductor includes first and second traces, while the second inductor includes third and fourth traces that are disposed inside the first and third traces respectively. This merging approach achieves path switching capability through a compact, integrated design rather than separate components, reducing overall device complexity.
Data Source
AI summary
An inductor device includes a first inductor, a switch, and a second inductor. The first inductor includes a first, a second, a third, and a fourth trace. The first trace is disposed at a first area of the inductor device. The second trace is disposed inside the first trace. The third trace is disposed at a second area of the inductor device. The fourth trace is disposed inside the third trace. When the switch is turned off, the first, the second, the third, and the fourth trace form first path. When the switch is turned on, the first, the third, and the fourth trace form second path. The second inductor includes a fifth and a sixth trace. The fifth trace is disposed at the first area of the inductor device. The six trace is disposed at the second area of the inductor device, and coupled to the fifth trace.